Commercial drones like this typically come with enough batteries to run non-stop. Even at the standard 1C charge rate, you'd only need 4 batteries to effective

Commercial drones like this typically come with enough batteries to run non-stop. Even at the standard 1C charge rate, you'd only need 4 batteries to effectively fly non-stop. In the article they mention the system was meant for rough terrain where they were hand-spraying because the tractor couldn't get there, but I guess they're working on making it viable for large flat farms now.